Leaf problem

Hey there Marsad, you have thrips which are basically little flies that get attracted to humidity. it's actually quite easy to get rid of them : they like overwatered medium so just give your medium 24hours + more time before you water so the coco dries up and breaks the eggs in the soil. for the adults it's simple with some bug catching sticky tape or strips, add them at different levels in the grow room also near the pots and soil. If you do this the problem will stop spreading and the bugs should disappear. Next time try to add bacilus subtilis and trichoderma to your medium as a preventative measure. Hope this helps ! 🚀